Seat Heating System - Electrical Diagnostics: Other Jeep Commander I

Monitor Conditions

1. When Monitored: Ignition on.

Set Conditions

1. Set Condition: This code is set when the Cluster detects the heated seat switch sense circuit is shorted low.

Possible Causes

Scheme 4

1. 1) VERIFY THAT DTC B1085-LEFT HEATED SEAT SWITCH INPUT CIRCUIT LOW IS ACTIVE With the scan tool, record and erase DTC's Cycle the ignition switch off then back on. With the scan tool, read DTC's. Does the DTC B1085 LEFT HEATED SEAT SWITCH INPUT CIRCUIT LOW reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) HEATED SEAT SWITCH With the scan tool, record and erase DTC's Disconnect the lower switch bank connector. Cycle the ignition switch off then back on. With the scan tool, read DTC's. Does the DTC B1085 LEFT HEATED SEAT SWITCH INPUT CIRCUIT LOW reset? Yes Go to 3) . No Replace the lower switch bank. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
3. 3) CHECK THE (P365) LEFT HEATED SEAT SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND Disconnect the Cluster C3 connector. Measure the resistance between ground and the (P365) Left Heated Seat Switch Sense circuit. Was the resistance below 5.0 ohms? Yes Repair the (P365) Left Heated Seat Switch Sense circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Replace the Cluster. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

Scheme 5

1. When Monitored: Ignition on.

1. Set Condition: This code is set whenever the Cluster detects the heated seat switch sense circuit is shorted low.

Scheme 6

1. 1) VERIFY THAT DTC B1088-RIGHT HEATED SEAT SWITCH INPUT CIRCUIT LOW IS ACTIVE With the scan tool, record and erase DTC's Cycle the ignition switch off then back on. With the scan tool, read DTC's. Does the DTC B1088 RIGHT HEATED SEAT SWITCH INPUT CIRCUIT LOW reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) HEATED SEAT SWITCH With the scan tool, record and erase DTC's Disconnect the lower switch bank connector. Cycle the ignition switch off then back on. With the scan tool, read DTC's. Does the DTC B1088 RIGHT HEATED SEAT SWITCH INPUT CIRCUIT LOW reset? Yes Go to 3) . No Replace the lower switch bank. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
3. 3) CHECK THE (P366) RIGHT HEATED SEAT SWITCH SENSE CIRCUIT FOR A SHORT TO GROUND Disconnect the Cluster C3 connector. Measure the resistance between ground and the (P366) Right Heated Seat Switch Sense circuit. Was the resistance below 5.0 ohms? Yes Repair the (P366) Right Heated Seat Switch Sense circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Replace the Cluster. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

Scheme 7

1. When Monitored: Ignition on, during the heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module detects the control circuit shorted to ground.

Scheme 8

Scheme 9

Scheme 10

Scheme 11

Scheme 12

1. 1) VERIFY THAT DTC B1092-FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW IS ACTIVE With the scan tool, record and erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1092 FRONT LEFT SEAT HEATER CONTROL CIRCUIT LOW reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) DISCONNECT LEFT SEAT INLINE CONNECTOR AND READ DTC'S Disconnect the left seat inline connector. NOTE: Check connectors - Clean and repair as necessary. With the scan tool, erase HSM DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the scan tool display the same DTC? Yes Go to 6) . No Go to 3) .
3. 3) CHECK THE (P187) LEFT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND Measure between the (P187) Left Seat Heater B(+) Driver circuit at the seat inline connector (seat side) and the seat frame for a short to ground. Is the resistance below 1k ohms? Yes Repair/replace the pigtail/heating element as necessary for a short to ground condition. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 4) .
4. 4) CHECK THE LEFT CUSHION PAD HEATER RESISTANCE Disconnect the Left Cushion Pad Heater 2 - way connector. Check the resistance of the cushion heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the left cushion pad connector (component side). Was the resistance below 3.5 ohms? Yes Replace the heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 5) .
5. 5) CHECK THE LEFT SEAT BACK HEATER RESISTANCE Disconnect the Left Seat Back Heater 2 - way connector. NOTE: Check connectors - Clean and repair as necessary. Check the resistance of the seat back heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the left seat back connector (component side). Is the resistance below 4.0 ohms? Yes Replace the seat back heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
6. 6) Check the Left Seat Heater B(+) Driver circuit for a short to ground Disconnect the Heated Seat Module connector. NOTE: Check connectors - Clean and repair as necessary. Measure the (P187) Left Seat Heater B(+) Driver circuit to ground at the HSM connector. Cavity 3 for LHD and 4 for RHD Is the resistance below 5.0 ohms? Yes Repair the Left Seat Heater B(+) Driver circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Replace the Heated Seat Module. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

1. When Monitored: Ignition on, during the heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module detects an open in the seat heater B(+) driver circuit.

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE .

Scheme 13

Scheme 14

Scheme 15

Scheme 16

1. 1) VERIFY THAT DTC B1094-FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN IS ACTIVE With the scan tool, record and erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1094 FRONT LEFT SEAT HEATER CONTROL CIRCUIT OPEN reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT CUSHION Disconnect the Left Cushion Pad Heater 2 - way connector. Disconnect the Heated Seat Module 6 - way connector. NOTE: Check connectors - Clean and repair as necessary. Measure the resistance of the (P187) Left Seat Heater B(+) Driver circuit from the HSM 6 - way Cavity 3 for LHD and 4 for RHD to the Cushion Pad Heater 2 - way connector. Is the resistance below 2 ohms? Yes Go to 3) . No Repair the open Seat Heater B(+) Driver circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
3. 3) CHECK THE LEFT SEAT HEATER CUSHION GROUND CIRCUIT Using a 12-volt test light connected to 12-volts, check the ground circuit at the Heater Cushion Pad 2 - way connector. Does the test light illuminate brightly? Yes Go to 4) . No Repair the open ground circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
4. 4) CHECK THE LEFT CUSHION PAD HEATER RESISTANCE Check the resistance of the Cushion Pad Heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the 2 - way connector (component side). Is the resistance above 4.9 ohms? Yes Replace the seat cushion pad heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 5) .
5. 5) CHECK THE LEFT SEAT BACK HEATER RESISTANCE Disconnect the Left Seat Back Heater 2 - way connector. NOTE: Check connectors - Clean and repair as necessary. Check the resistance of the seat back heater element by measuring between the Left Seat Heater B(+) Driver and the Ground circuit at the connector 2 - way (component side). Is the resistance above 5.5 ohms? Yes Replace the seat back heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 6) .
6. 6) CHECK THE LEFT SEAT BACK HEATER GROUND CIRCUIT Using a 12-volt test light connected to 12-volts, check the ground circuit at the Seat Back Heater 2 - way connector. Does the test light illuminate brightly? Yes Go to 7) . No Repair the open ground circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
7. 7) CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT BACK NOTE: Check connectors - Clean and repair as necessary. Measure the (P187) Left Seat Heater B(+) Driver circuit from the Seat Back connector to the HSM connector. Cavity 3 for LHD and 4 for RHD. Is the resistance below 2.0 ohms? Yes Replace the Heated Seat Module. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Repair the (P187) Left Seat Heater B(+) Driver circuit for an open back to the splice. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

Scheme 17

1. When Monitored: Ignition on, during the heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module detects the control circuit shorted to ground.

Scheme 18

Scheme 19

1. 1) VERIFY THAT DTC B1096-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW IS ACTIVE With the scan tool, record and erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1096 FRONT RIGHT SEAT HEATER CONTROL CIRCUIT LOW reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) DISCONNECT RIGHT SEAT INLINE CONNECTOR AND READ DTC'S Disconnect the right seat inline connector. NOTE: Check connectors - Clean and repair as necessary. With the scan tool, erase HSM DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the scan tool display the same DTC? Yes Go to 6) . No Go to 3) .
3. 3) CHECK THE (P188) RIGHT SEAT HEATER B(+) DRIVER FOR A SHORT TO GROUND Measure between the (P188) Right Seat Heater B(+) Driver circuit at the seat inline connector (seat side) and the seat frame for a short to ground. Is the resistance below 1k ohms? Yes Repair/replace the pigtail/heating element as necessary for a short to ground condition. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 4) .
4. 4) CHECK THE RIGHT CUSHION PAD HEATER RESISTANCE Disconnect the Right Cushion Pad Heater 2 - way connector. Check the resistance of the cushion heater element by measuring between the (P188) Right Seat Heater B(+) Driver and the Ground circuit at the right cushion pad connector (component side). Was the resistance below 3.5 ohms? Yes Replace the heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 5) .
5. 5) CHECK THE RIGHT SEAT BACK HEATER RESISTANCE Disconnect the Right Seat Back Heater 2 - way connector. NOTE: Check connectors - Clean and repair as necessary. Check the resistance of the seat back heater element by measuring between the (P188) Right Seat Heater B(+) Driver and the Ground circuit at the right seat back connector (component side). Is the resistance below 4.0 ohms? Yes Replace the seat back heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Using the wiring diagram/schematic as a guide, inspect the wiring and connectors for an intermittent short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
6. 6) Check the (P188) Right Seat Heater B(+) Driver circuit for a short to ground Disconnect the Heated Seat Module connector. NOTE: Check connectors - Clean and repair as necessary. Measure the (P188) Right Seat Heater B(+) Driver circuit to ground at the HSM connector. Cavity 4 for LHD and 3 RHD. Is the resistance below 5.0 ohms? Yes Repair the (P188) Right Seat Heater B(+) Driver circuit for a short to ground. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Replace the Heated Seat Module. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

1. When Monitored: Ignition on, during the heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module detects an open in the seat heater B(+) driver circuit.

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. 1) VERIFY THAT DTC B1098-FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN IS ACTIVE With the scan tool, record and erase DTC's Operate the Heated Seat Switch in both positions several times. With the scan tool, read DTC's. Does the DTC B1098 FRONT RIGHT SEAT HEATER CONTROL CIRCUIT OPEN reset? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT CUSHION Disconnect the Right Cushion Pad Heater 2 - way connector. Disconnect the Heated Seat Module 6 - way connector. NOTE: Check connectors - Clean and repair as necessary. Measure the resistance of the (P188) Right Seat Heater B(+) Driver circuit from the HSM 6 - way to the Cushion Pad Heater 2 - way connector. Cavity 4 for LHD and 3 for RHD. Is the resistance below 2 ohms? Yes Go to 3) . No Repair the open Seat Heater B(+) Driver circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
3. 3) CHECK THE RIGHT SEAT HEATER CUSHION GROUND CIRCUIT Using a 12-volt test light connected to 12-volts, check the ground circuit at the Heater Cushion Pad 2 - way connector. Does the test light illuminate brightly? Yes Go to 4) . No Repair the open ground circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
4. 4) CHECK THE RIGHT CUSHION PAD HEATER RESISTANCE Check the resistance of the Cushion Pad Heater element by measuring between the Right Seat Heater B(+) Driver and the Ground circuit at the 2 - way connector (component side). Is the resistance above 4.9 ohms? Yes Replace the seat cushion pad heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 5) .
5. 5) CHECK THE RIGHT SEAT BACK HEATER RESISTANCE Disconnect the Right Seat Back Heater 2 - way connector. NOTE: Check connectors - Clean and repair as necessary. Check the resistance of the seat back heater element by measuring between the Right Seat Heater B(+) Driver and the Ground circuit at the connector 2 - way (component side). Is the resistance above 5.5 ohms? Yes Replace the seat back heater element as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Go to 6) .
6. 6) CHECK THE RIGHT SEAT BACK HEATER GROUND CIRCUIT Using a 12-volt test light connected to 12-volts, check the ground circuit at the Seat Back Heater 2 - way connector. Does the test light illuminate brightly? Yes Go to 7) . No Repair the open ground circuit. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
7. 7) CHECK FOR AN OPEN SEAT HEATER B(+) DRIVER FROM HSM TO SEAT BACK NOTE: Check connectors - Clean and repair as necessary. Measure the (P188) Right Seat Heater B(+) Driver circuit from the Seat Back connector to the HSM connector. Cavity 4 for LHD and 3 for RHD. Is the resistance below 2.0 ohms? Yes Replace the Heated Seat Module. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Repair the (P188) Right Seat Heater B(+) Driver circuit for an open back to the splice. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

1. When Monitored: Ignition on.

1. Set Condition: This code is set when the Cluster detects a stuck heated seat switch.

1. When Monitored: Ignition on.

1. Set Condition: This code is set whenever the Cluster detects a stuck heated seat switch.

1. When Monitored: Engine running, during heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module receives a low charging system voltage message over the CAN B Bus or detects voltage under 11.3 volts on the (A33) Fused B(+) circuit.

Scheme 24

1. 1) CHECK PCM FOR CHARGING SYSTEM DTC With the scan tool, read Powertrain Control Module DTC's. Are there any Charging System DTC's set in the Powertrain Control Module? Yes Refer to «DIAGNOSIS AND TESTING»(ref-288243-S40126420242008062000000) for Charging System diagnostic procedures. No Go to 2) .
2. 2) VERIFY THAT DTC B210D-BATTERY VOLTAGE LOW IS ACTIVE With the scan tool, record and erase DTC's Turn the ignition switch to the Off position then start the engine and let run for one minute. With the scan tool, read DTC's. Does the DTC B210D-BATTERY VOLTAGE LOW reset? Yes Go to 3) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
3. 3) CHECK THE VOLTAGE ON THE (A33) FUSED B(+) CIRCUIT Disconnect the Heated Seat Module connector. NOTE: Check connectors - Clean and repair as necessary. Start the engine and let idle. Measure the voltage on the (A33) Fused B(+) circuit at the HSM connector and compare to voltage at the vehicle battery. Is the voltage at the HSM connector the same as measured at the battery? Yes Replace the Heated Seat Module in accordance with the service information. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Repair the (A33) Fused B(+) circuit as necessary. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

1. When Monitored: Engine running, during heated seat operation.

1. Set Condition: This code is set immediately after the Heated Seat Module receives a high charging system voltage message over the CAN B Bus or detects voltage over 15 volts on the (A33) Fused B(+) circuit.

1. When Monitored: Ignition on.

1. Set Condition: This code is set immediately if the Heated Seat Module internal self test fails.

1. When Monitored: Continuously.

1. Set Condition: Whenever the Can B Bus (+) or B Bus (-) circuit is open, shorted to voltage or shorted to ground, this code will set.

Scheme 25

Scheme 26

1. 1) TEST FOR INTERMITTENT CONDITION Turn the ignition on. With the scan tool, record and erase DTC's Cycle the ignition from on to off three times. Turn the ignition on. With the scan tool, read DTC's. Does the scan tool display U0019 CAN B BUS CIRCUIT? Yes Go to 2) . No The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
2. 2) CHECK FRONT CONTROL MODULE DTC's With the scan tool, read Front Control Module DTC's Does the scan tool display any CAN B BUS DTC's - ACTIVE? Yes Refer to the symptom list for problems related to Communication. Refer to «DIAGNOSIS AND TESTING»(ref-288232-S40396979612008062000000) . No Go to 3) .
3. 3) CAN B BUS (+) CIRCUIT OPEN Turn the ignition off. Disconnect the Heated Seat Module connector. Disconnect the Front Control Module C1 connector. Measure the resistance of the (D55) Can B Bus (+) circuit between the Front Control Module C1 connector and the Heated Seat Module connector. Is the resistance below 2.0 ohms? Yes Go to 4) . No Repair the Can B Bus (+) circuit for an open. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .
4. 4) CAN B BUS (-) CIRCUIT OPEN Measure the resistance of the (D54) Can B Bus (-) circuit between the Front Control Module C1 connector and the Heated Seat Module connector. Is the resistance below 2.0 ohms? Yes Replace the Heated Seat Module. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) . No Repair the Can B Bus (-) circuit for an open. Perform «BODY VERIFICATION TEST - VER 1»(ref-288258-S25235328252008062000000) .

1. When Monitored: Continuously.

1. Set Condition: This code will set if either the Can B Bus (+) or (-) circuits are open.